IC 338

IC 338 is a spiral galaxy in the constellation Taurus about 272 million ly from Earth. It spans roughly 66,000 ly, about 66% of our Milky Way's width. The light reaching us tonight left it about 272 million years ago.

Because its light is 272 million ly from home, you are seeing IC 338 as it looked roughly 272 million years ago. The photons left before that much of history had passed, and are only now reaching us. This distance is estimated from the galaxy's redshift, so the lookback time is approximate.

Source: structural data (position, morphology, brightness, redshift) from OpenNGC (CC BY-SA). Recession velocity from RC3 (de Vaucouleurs et al. 1991, via NASA/HEASARC, public domain). Distance computed by gravityfinder from redshift via Hubble's law (H0 = 70 km/s/Mpc).